Asset referencing error on a Python Pipeline Asset

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1. Activate the Asset Referencing Restrictions plugin
2. Create a PythonPipelineTest.py file in the Content/Python folder of your project
3. Copy code from https://docs.unrealengine.com/5.2/en-US/importing-assets-using-interchange-in-unreal-engine/ into your python file
4. Add the PythonPipelineTest.py to your list of python startup in project settings
5. Restart project
6. Create a Interchange Python Pipeline (right click>Miscellaneous) and pick the PythonPipelineTest class
7. Right-click on the asset > Asset Actions > Validate asset